Somehow I dun understand HGDEP logic... Now that HGDEP got many
Citaro intakes plus some more Citaros/K230UBs transferred from
SLBP, why can't they just do a one time MK3 replacement for bus
services like 43, 109 and 163 that still have 1-2 perm MK3s running
around?
Since the MK3s are going off very soon, might as well let all
the remaining HGDEP MK3s run SP for their final months. Rather than
letting the new buses run around wonderlessly without being
assigned anywhere...
Just my opinion, no flaming here.
Yeah i get what you mean, it make more sense for the starter to
kick out the Mk3s now when there's excess Citaros, instead of
leaving it to just before it is going to de-reg then find
replacements. 
But i guess, they feel that they need to keep some Citaros as
spares for their WAB services? Cause you can't put all the
remaining Mk3s forever and let them run on all those WAB services
to replace a missing WAB, the passengers will start writing in to
complain. 